Method of post-polymerization stabilization of high activity cat

Details Method of post-polymerization stabilization of high activity cat Method of post-polymerization stabilization of high activity cat

1996-05-20

1999-04-27

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528275, 528279, 528280, 528281, 528283, 528284, 528285, 528308, 5283086, 524706, 524710, C08G 6378

Patent

active

058980580

ABSTRACT:
A continuous process for producing polyethylene terephthalate polyester from terephthalic acid and ethylene glycol uses a stabilizer, preferably containing phosphorous, to produce a high quality polyethylene terephthalate polyester which is relatively free of the acetaldehyde and discoloration which are associated with the post-polymerization activity of a polymerization catalyst. The stabilizer is preferably added at or after the end of the polymerization reaction prior to polymer processing to deactivate the polymerization catalyst and can increase the throughput of the polyester without adversely affecting the thermal stability of the polyethylene terephthalate polyester. Alternatively, the late addition of the stabilizer can increase the thermal stability of the polyester without adversely affecting the throughput of the polyethylene terephthalate polyester.

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